Cavities and cores are three-dimensional surface.
The external and internal shapes of plastic parts are directly formed by the cavity and the core. These complicated three-dimensional profiles are difficult to process, especially the blind hole-type internal molding surface processing of the cavity. If the traditional processing method is adopted, not only Workers are required to have a high level of technology, many auxiliary tools, many tools, and long processing cycles.
High precision and surface quality requirements, long service life requirements.
At present, the dimensional accuracy of plastic parts is generally IT6-7, and the surface roughness is Ra0.2-0.1μm. The dimensional accuracy of the corresponding injection mold parts is IT5-6, and the surface roughness Ra is less than 0.1μm.
The roughness of the recording surface of the laser disc must be 0.02-0.01μm to the level of mirror processing. This requires the surface roughness of the mold to be less than 0.01μm. Long-life injection molds are necessary to increase the efficiency and reduce the cost. The service life is generally required to exceed 1 million times.
Precision injection molds should use a rigid mold base, increase the thickness of the template, increase the support column or conical positioning elements to prevent the mold from being deformed under pressure, and sometimes the internal pressure can reach 100 MPa.
The ejector device is an important factor that affects the deformation and dimensional accuracy of the product. Therefore, the best ejector point should be selected so that the mold release is uniform. High-precision injection molds are mostly structurally inlaid or fully assembled. The precision and interchangeability of mold parts are greatly improved.
Long process flow, tight manufacturing time.
For injection molded parts, most of them are integrated with other parts to form a complete product, and in many cases, all other parts have already been completed, and it is urgent to wait for the injection molding parts to be listed on the market. This is because the shape or dimensional accuracy of the products is very strict. High, combined with the different properties of the resin material, after the completion of the mold manufacturing, it is necessary to repeat the trial and correction, so that the development and delivery time is very tight.
Off-site design, off-site manufacturing.
Mold manufacturing is not the ultimate goal, but the final product design is proposed by the user. The mold manufacturer designs and manufactures the mold according to the user's requirements. In most cases, the injection production of the product is also in other manufacturers. This results in product design. , Mold design and manufacturing and product production in different places.
Professional division of labor, dynamic combination.
The small production volume of molds generally belongs to the production of single pieces, but the molds require many standard parts, ranging from mold bases to small pins. These can not and cannot be done by only one manufacturer alone, and the manufacturing process is complicated, general equipment and numerical control The use of equipment is extremely uneven.